28706611 has 4 divisors (see below), whose sum is σ = 28728000. Its totient is φ = 28685224.

The previous prime is 28706609. The next prime is 28706617. The reversal of 28706611 is 11660782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28706611 - 2¹ = 28706609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28706617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8536 + ... + 11413.

It is an arithmetic number, because the mean of its divisors is an integer number (7182000).

Almost surely, 2^28706611 is an apocalyptic number.

28706611 is a deficient number, since it is larger than the sum of its proper divisors (21389).

28706611 is a wasteful number, since it uses less digits than its factorization.

28706611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21388.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28706611 is about 5357.8550745611. The cubic root of 28706611 is about 306.1920953413.

The spelling of 28706611 in words is "twenty-eight million, seven hundred six thousand, six hundred eleven".